When a strong man armed keepeth his (e) palace, his goods are in peace:
(e) The word properly signifies an open and empty room in front of a house, and so in translation is taken for noblemen's houses.

When a strong man armed,.... By the strong man, is meant the devil; See Gill on Matthew 12:29 and who may be said to be "armed", both with his own temptations, which are as fiery darts, and which are thrown by him thick and fast, suddenly and swiftly, privily, and with great art and cunning, and with great strength, and are very injurious; and also with the sins and lusts of men, which are armour of unrighteousness, and which Satan turns upon them, and makes use of against them, to their great detriment; and who
keepeth his palace: which is the corrupt heart of an unregenerate man, where he dwells as a king, has his throne, keeps his court, and has his courtiers, and attendants, the lusts of the flesh, and the desires of the will, and the carnal affections; and which, as filthy a palace as it is, is perfectly agreeable to his nature; and this is kept by a guard of devils, and worldly lusts, till its strong holds are demolished by the Gospel, and Christ the King of glory enters in; till such time,
his goods are in peace: there is no concern in such an heart about sin, no uneasiness on that account, no sense of danger, nor inquiry after salvation; no dread upon the mind at the curses of the law, nor fears of hell, and damnation; but such a man lives in entire security, crying Peace, Peace, to himself.

strong man--meaning Satan.
armed--pointing to all the subtle and varied methods by which he wields his dark power over men.
keepeth--"guardeth."
his palace--man whether viewed more largely or in individual souls--how significant of what men are to Satan!
in peace--undisturbed, secure in his possession.

The strong one armed - The devil, strong in himself, and armed with the pride, obstinacy, and security of him in whom he dwells.